Autocomplete,
when added to an input field, enables users to quickly find and select from a
pre-populated list of values as they type, leveraging searching and filtering.

By giving
an Autocomplete field focus or entering something into it, the plugin starts
searching for entries that match and displays a list of values to choose from.
By entering more characters, the user can filter down the list to better
matches.

Built with focus on performance - results for every
query are cached and pulled from local cache for the same repeating query. If
there are no results for particular query it stops sending requests to the
server for other queries with the same root.

Autocomplete
an input field to enable users quickly finding and selecting some value,
leveraging searching and filtering.

By giving
an autocompleted field focus or entering something into it, the plugin starts
searching for matching entries and displays a list of values to choose from. By
entering more characters, the user can filter down the list to better matches.

Tokeninput is a
jQuery plugin which allows your users to select multiple items from a
predefined list, using autocompletion as they type to find each item. You may
have seen a similar type of text entry when filling in the recipients field
sending messages on facebook.

This jQuery Ajax autosuggest plugin
has the usual functionality with a little extra flexibility: multiple
instances, passing custom parameters, the id and the value are returned,
keyboard-controlled, and a few others… Almost anything you need from an autosuggest plugin
you can do with the built-in options! I didn’t focus on style, the CSS file is
small and very easily changed

sir i want autocomplete search box which show result in groups..like (www.uread.com) search box...i have many tutorial but they are static if i make dynamic they did not give result as per rquirement..sir plz help me .and suggest me ..thanks a lot ..